I found it odd, but I did not find anything in the OM relating to a service interval for the fuel filter, but the manual does tell the owner to inspect the lines at each service point. ? hummm....
This is "rub" I have with modern "acceptable" practices. A fuel filter is a service item, and therefore it should be in a serviceable location, period... a simple plastic see through type, and then the when to change point becomes obvious...
This is getting way to common on ALL vehicles (not just a Guzzi thing). couple this crappy design concept with the "dealer only service" mentality, that is also getting too common, only increases our cost of ownership, and frustrations.
sorry... morning rant